わずか斜めに入射する球面波のすだれ状細平板配列からの反射音場

概要

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To analyze a reflected sound field from objects is important in acoustical engineering as it pertains to sonar, non-destructive inspection, or diagnosis. This paper presents an analytical technique for calculating the amplitude of reflected sound waves from a fine board array of infinite length in oblique incidence. This theory is based on the assumption that a sound source and a receiving point are located separately and that the restriction is a reflect angle that is the same as an incident one. This is based on geometrical optics. Reflectivity is defined the "sound pressure reflection coefficient" ; in other words, the ratio of the velocity potential of the reflected sound wave to a calculated one. Furthermore, in order to verify the validity of this approach, several experiments were conducted in air using ultrasonic waves that were at a frequency of 39.80 kHz. The measured values showed good coincidence with the approximately calculated ones. By considering this results, the presented technique is useful to analyze the reflection of sound waves from a fine board array of infinite length.
社団法人日本音響学会の論文